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Exp#5ChemEveryDayLife - Chem 11 Pre-laboratory Assignment 1...

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Chem 11 Exp. #5 Chemicals in Everyday Life Pre-laboratory Assignment 1. Read in Zumdahl, Selective Precipitation, pages 106-107. 2. Review in Zumdahl, Precipitation Reactions , pages 99-104. 3. Review in Zumdahl, Describing Reactions in Solution , pages 104-107. 4. Prepare in your laboratory notebook a table similar to the one shown below. This table will be used for collecting data for 11 unknowns. Unknown # Appearance Solubility (~25 o C) pH H 2 SO Test Starch Test Chloride Test Carbonate Sulfate Test Protein Test Long-wave UV test Introduction In this laboratory experiment, the chemistry of common household substances will be analyzed. The following substances will be studied: Table salt (sodium chloride, NaCl); Granular sugar (sucrose, C 12 H 22 O 11 ); Confectionery sugar (sucrose, C 12 H 22 O 11 ); Baking soda (sodium bicarbonate, NaHCO 3 ); Corn starch [(C 6 H 10 O 5 ) n ]; Talcum powder (magnesium silicate, MgSiO 3 ); Powder similar to the powder called Shower-to- Shower (containing corn starch, talcum, and sodium bicarbonate); Laundry detergent (containing whitening agents); Epsom salt (magnesium sulfate, MgSO 4 ); Powdered milk (protein); Flour (starch and protein). A common feature among all of these substances is that they are all solid white substances. Physical and chemical properties of these substances are shown in Table 1. The common household substances to be studied will not be labeled with trade names or chemical formulas. Each substance will be analyzed using a series of chemical tests. The data obtained from these experiments will be used to identify each substance. Procedure DO NOT TASTE ANY SUBSTANCES 1. After reading through the entire laboratory procedure, prepare (in your laboratory notebook) a table for data collection (refer to Table 1). 2. Record the physical appearance of each substance. 3. Dissolve 0.200 g of each substance in 2 mL of deionized H 2 O. Use 13x100-mm test tubes. Clean off the spatula between each measurement. Do not cross-contaminate the samples. Clearly label each test tube.
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